Odds bodkins, you are right, JohnD...
https://support.microsoft.com/en-us/help/4567512
June 16, 2020—KB4567512 (OS Builds 18362.904 and 18363.904)
It says it's unavailable at Windows Update, but is available here...
https://www.catalog.update.microsoft.com/Search.aspx?q=KB4567512
Microsoft Update Catalog -- KB4567512
Take the one that matches what is seen at "Right-click START, System" regarding Edition, Version & Architecture. For me, it would be Windows 10 Home, version 1909, & 64-bit...
It would be like that for the SSU (KB4560959) too, but I think everyone already has that at "START, Settings, Update & Security, View Update History, Uninstall updates"...